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eap: Extract md5 logic into eap-md5.c

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Tim Kourt 2016-11-20 14:06:55 -08:00 committed by Denis Kenzior
parent 1a64c4b771
commit b0930d8f79
2 changed files with 145 additions and 110 deletions
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145
src/eap-md5.c Normal file
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@ -0,0 +1,145 @@
/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2016 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <ell/ell.h>
#include "eap.h"
struct eap_md5_state {
char *secret;
};
static int eap_md5_probe(struct eap_state *eap, const char *name)
{
struct eap_md5_state *md5;
if (strcasecmp(name, "MD5"))
return -ENOTSUP;
md5 = l_new(struct eap_md5_state, 1);
eap_set_data(eap, md5);
return 0;
}
static void eap_md5_remove(struct eap_state *eap)
{
struct eap_md5_state *md5 = eap_get_data(eap);
eap_set_data(eap, NULL);
l_free(md5->secret);
l_free(md5);
}
static void eap_md5_handle_request(struct eap_state *eap,
const uint8_t *pkt, size_t len)
{
struct eap_md5_state *md5 = eap_get_data(eap);
const uint8_t *value;
struct l_checksum *hash;
uint8_t identifier, response[5 + 1 + 16];
if (len < 1 || len < (size_t) pkt[0] + 1 || pkt[0] < 1) {
l_error("EAP-MD5 request too short");
goto err;
}
value = pkt + 1;
hash = l_checksum_new(L_CHECKSUM_MD5);
if (!hash) {
l_error("Can't create the MD5 checksum");
goto err;
}
eap_save_last_id(eap, &identifier);
l_checksum_update(hash, &identifier, 1);
l_checksum_update(hash, md5->secret, strlen(md5->secret));
l_checksum_update(hash, value, pkt[0]);
response[5] = 16;
l_checksum_get_digest(hash, response + 6, 16);
l_checksum_free(hash);
eap_send_response(eap, EAP_TYPE_MD5_CHALLENGE,
response, sizeof(response));
/* We have no choice but to call it a success */
eap_method_success(eap);
return;
err:
eap_method_error(eap);
}
static bool eap_md5_load_settings(struct eap_state *eap,
struct l_settings *settings,
const char *prefix)
{
struct eap_md5_state *md5 = eap_get_data(eap);
char setting[64];
snprintf(setting, sizeof(setting), "%sMD5-Secret", prefix);
md5->secret = l_strdup(l_settings_get_value(settings,
"Security", setting));
if (!md5->secret) {
l_error("EAP-MD5 secret is missing");
return false;
}
return true;
}
static struct eap_method eap_md5 = {
.request_type = EAP_TYPE_MD5_CHALLENGE,
.exports_msk = false,
.name = "MD5",
.probe = eap_md5_probe,
.remove = eap_md5_remove,
.handle_request = eap_md5_handle_request,
.load_settings = eap_md5_load_settings,
};
static int eap_md5_init(void)
{
l_debug("");
return eap_register_method(&eap_md5);
}
static void eap_md5_exit(void)
{
l_debug("");
eap_unregister_method(&eap_md5);
}
EAP_METHOD_BUILTIN(eap_md5, eap_md5_init, eap_md5_exit)

110
src/eap.c
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@ -526,113 +526,3 @@ void eap_exit(void)
__eap_method_disable(__start___eap, __stop___eap);
l_queue_destroy(eap_methods, NULL);
}
struct eap_md5_state {
char *secret;
};
static int eap_md5_probe(struct eap_state *eap, const char *name)
{
if (strcasecmp(name, "MD5"))
return -ENOTSUP;
eap->method_state = l_new(struct eap_md5_state, 1);
return 0;
}
static void eap_md5_remove(struct eap_state *eap)
{
struct eap_md5_state *md5 = eap_get_data(eap);
eap_set_data(eap, NULL);
l_free(md5->secret);
l_free(md5);
}
static void eap_md5_handle_request(struct eap_state *eap,
const uint8_t *pkt, size_t len)
{
struct eap_md5_state *md5 = eap_get_data(eap);
const uint8_t *value;
struct l_checksum *hash;
uint8_t identifier, response[5 + 1 + 16];
if (len < 1 || len < (size_t) pkt[0] + 1 || pkt[0] < 1) {
l_error("EAP-MD5 request too short");
goto err;
}
value = pkt + 1;
hash = l_checksum_new(L_CHECKSUM_MD5);
if (!hash) {
l_error("Can't create the MD5 checksum");
goto err;
}
eap_save_last_id(eap, &identifier);
l_checksum_update(hash, &identifier, 1);
l_checksum_update(hash, md5->secret, strlen(md5->secret));
l_checksum_update(hash, value, pkt[0]);
response[5] = 16;
l_checksum_get_digest(hash, response + 6, 16);
l_checksum_free(hash);
eap_send_response(eap, EAP_TYPE_MD5_CHALLENGE,
response, sizeof(response));
/* We have no choice but to call it a success */
eap_method_success(eap);
return;
err:
eap_method_error(eap);
}
static bool eap_md5_load_settings(struct eap_state *eap,
struct l_settings *settings,
const char *prefix)
{
struct eap_md5_state *md5 = eap_get_data(eap);
char setting[64];
snprintf(setting, sizeof(setting), "%sMD5-Secret", prefix);
md5->secret = l_strdup(l_settings_get_value(settings,
"Security", setting));
if (!md5->secret) {
l_error("EAP-MD5 secret is missing");
return false;
}
return true;
}
static struct eap_method eap_md5 = {
.request_type = EAP_TYPE_MD5_CHALLENGE,
.exports_msk = false,
.name = "MD5",
.probe = eap_md5_probe,
.remove = eap_md5_remove,
.handle_request = eap_md5_handle_request,
.load_settings = eap_md5_load_settings,
};
static int eap_md5_init(void)
{
l_debug("");
return eap_register_method(&eap_md5);
}
static void eap_md5_exit(void)
{
l_debug("");
eap_unregister_method(&eap_md5);
}
EAP_METHOD_BUILTIN(eap_md5, eap_md5_init, eap_md5_exit)